Permutation lock



' y ,1932. w. F. FOERSTER 1,356,989

PERMUTATION LOCK Filed May 14, 1931 Patented May 3, 1932 UNITED STATESPATENT WALTER FRED ronnsrnca, or EVANSVILLE, INDIANA, ASSIGNOB OFFICE,

or ONE-HALF 'ro FREDERICK WILLIAM BOERNER OF P O SEY COUNTY, INDIANAPERMUTATION, Loci:

Application filed May 14,

This invention relates to those permutation locks comprising a pluralityof rotatable discs, combined with a sliding U -shaped hasp.

The object of the invention is to provide, first, improved false ordecoy discs whose character is not determinable by the person using thelock; second, to provide an improved combination of hasp, permutationdiscs, and decoy discs; third, to generally improve the lock, renderingit more difiicult to manipulate by one not familiar with itscombination; and, also, provide a lock which will be simple, inexpensiveto manufacture, very strong and durable, and light in weight by reasonof the fact that its parts may be stamped from sheet' metal and the haspdrop-forged.

In the accompanying drawings:

Figure 1 is a side elevation;

Fig. 2 is a vertical section, the pin and hasp being in full lines;

Figs. 3 and 4 are plan views of the top and bottom discs of the cage;

Figs. 5 and 6 are plan views of the upper locking disc and the upperdecoy disc, respectively;

Figs. 7, 8, 9, 10 are edge views of the discs of Figs. 3, 4, 5, 6,respectively;

Figs. 11, 12, 13 are plan views of the central locking disc, the lowerdecoy disc, and the bottom locking disc, respectively;

Figs. 14, l5, 16 are edge views of the discs of Figs. ll, 12 and 13; and

Fig. 17 is a side elevation of the hasp.

The top disc of the barrel of the lock appears at l and the bottom discis shown at 2, the two being connected by a pin 3 having reduced ends 4which pass through holes 5 in the discs 1 and 2 and are headed orriveted down against said discs, as shown at 6. The discs 1, 2 and pin 3constitute a rigid cage or body for the permutation discs 7,8, 9 and thefalse or decoy discs 10, 11, while the cylindrical pin 3 passes throughthe holes 12 in all of said discs, thus rotatably mounting all of thediscs on the pin and permanently retaining them between the heads ordiscs 1 and 2.

The decoy discs 10, 11 have nearly complete arc-shaped slots 13, 14,respectively.

The permutation discs 7, 8, 9 have arc- The said ward 1931." swarm.537,435.

shaped slots 15, v16 17 respectively andeach I ofthepermutatioirloclging discs 8, 9 has a notch,1l8,l9, respectively "forthe reception of the, long leg of the hasp, which appears at 20. l Theuppermost looking or permutation disc7 has two of the notches, '21because it has to accommodate both :of the legs of the hasp or staple20. I i v All of the discs are p-rovidedwith numbers or letters or otherindicia, as usual inx locks of this general character, as shown at 22,and these discs are knurled to facilitate their manipulation.

The hasp or staple 20 is of U-shape, having a short leg provided with anotch 23 and a long leg provided with notches 24 defining the wards 25,26, respectively. The ward- 26 is slightly larger than the hole 27 inthe upper head or disc 1, although it is smaller than the slots 13, 14and the notches 18, 19,21. 26 which is on the end of the longer leg ofthe hasp, is adapted to be received in a circular cavity 28 in the head2.

The heads 1, 2 and the discs 7, 8, 9, 10, 11 may be cheaply and easilymanufacturedas stampings. The pin 3 and the hasp 20 are forgings.

The invention is not limited to the use of any given number of lockingand decoy discs.

What I claim is:

1. A permutation lock of the rotatable disc and sliding hasp type,comprising a cage composed of top and bottom discs, and a pin connectingsaid discs, a hasp which is slidable through the top disc, and aplurality of independent discs each of which is rotatably mounted on thesaid pin and located between the top and bottom discs, certain ones ofsaid rotatable discs being locking discs adapted to lock or release thehasp, group of rotatable discs being of a false or decoy character, and,while being rotatable, having no locking action on the hasp.

2. A permutation lock comprising a cage composed of upper and lowerdiscs, a pin having reduced ends and headeddown thereupon, the uppermostdisc beingprovided with hasp-holes and the lowermost disc beingprovidedwith a cavity,

a plurality of locking discs rotatably mount.

and one of said ed on the pin and located between the upper and lowerfixed discs, said locking discs having arc-shaped slots provided withnotches, a false or decoy disc rotatably mounted on the pin and locatedin the. group of locking discs, said false or decoy disc having anareshaped slot, and a hasp of general U=shape having a short legprovided with a notch and ward and a long leg provided with notches andwards and terminating in an en larged ward which is'adapted to bereceived in the cavity in the lower fixed disc when the hasp is lockedand to prevent the long leg of the hasp from becoming detached from theup er disc, the legs of said hasp passing through the openings in wardson the hasp preventing the hasp from being pulled out except when thewards of ha notches, the slot in the said disc tobe'turned freelywithout interiering with the sliding action of the hasp. In testimonywhereof I afiix my signature. WALTER FRED FOERSTER.

the upper disc, the 4' are in ali nment'with the aforesaid decoy discermitting

